How Often Do Dogs Need the Bordetella Vaccine?

Most dogs that need the Bordetella vaccine get it once a year, though some veterinarians and boarding facilities request it every six months for dogs with heavy social exposure. The vaccine is classified as “noncore,” meaning not every dog needs it at all. Your dog’s schedule depends on the type of vaccine used, how much contact your dog has with other dogs, and what your boarding facility or groomer requires.

Which Dogs Actually Need the Bordetella Vaccine

The American Animal Hospital Association (AAHA) classifies Bordetella as a noncore vaccine, meaning it is recommended based on individual risk rather than given to every dog universally.¹ Core vaccines like distemper and rabies go to all dogs regardless of lifestyle. Bordetella vaccination is aimed at dogs whose daily lives bring them into regular contact with other dogs, especially in enclosed spaces where the bacterium spreads easily through respiratory droplets.

The dogs that benefit most include those that go to boarding kennels, doggy daycare, dog parks, grooming salons, training classes, or dog shows. Dogs that live in multi-dog households or spend time in shelters are also strong candidates. If your dog rarely interacts with unfamiliar dogs and doesn’t visit shared facilities, your vet may skip the vaccine entirely. That said, many boarding and grooming facilities require proof of current Bordetella vaccination before they’ll accept your dog, so the practical reality is that most socially active dogs end up on a regular schedule whether the vet considers them high-risk or not.

The Three Vaccine Types and Their Schedules

Bordetella vaccines for dogs come in three forms, and the type your vet uses affects the recommended frequency and how quickly protection kicks in.

Intranasal: A liquid squirted into the nose. This is one of the most common forms. It stimulates local immunity right where the infection enters, producing antibodies in the nasal passages. A single dose is typically given, with annual boosters. Some facilities and veterinarians prefer every six months for dogs with heavy exposure. Protection begins relatively quickly, often within a few days, because the vaccine acts locally rather than waiting for a full systemic immune response.
Oral: A liquid placed in the cheek pouch that the dog swallows. Like the intranasal version, the oral vaccine uses a live but weakened form of Bordetella bronchiseptica. A single dose is given, followed by annual boosters. Studies have shown the oral vaccine protects for at least a year after a single dose.
Injectable: Given as a shot under the skin. This requires an initial dose followed by a booster two to four weeks later, then annual revaccination. The injectable form takes a bit longer to build full immunity compared to the mucosal routes, but it avoids the sneezing or brief nasal discharge that some dogs experience with the intranasal version.

Research comparing intranasal and injectable vaccines in previously vaccinated adult dogs found that both stimulated strong antibody responses, though the intranasal vaccine produced higher levels of a specific type of antibody (serum IgA) associated with mucosal defense.² In practice, the choice often comes down to your dog’s temperament. Dogs that panic when something is squirted up their nose may do better with an injection or oral dose.

How Long Protection Actually Lasts

The standard recommendation of annual revaccination is backed by multiple challenge studies that deliberately exposed vaccinated dogs to the live bacterium to see if they got sick. Several studies have confirmed that a single dose of the oral vaccine protects dogs for at least one full year after vaccination.³ One study using a combination oral vaccine containing both Bordetella bronchiseptica and canine parainfluenza reached the same conclusion, showing disease prevention held up for at least a year.⁴

There is also evidence that protection may extend a few months beyond a year. A study specifically testing an oral Bordetella vaccine found that vaccinated dogs were still effectively protected against disease and shed less bacteria at thirteen months after a single dose compared to unvaccinated controls.⁵ This suggests that if you’re a week or two late on your dog’s annual booster, you’re probably still within a window of reasonable protection, though it’s not an invitation to skip the appointment altogether.

The reason some facilities insist on every six months rather than annually has less to do with published immunity data and more to do with a cautious approach. Kennel cough is highly contagious in group settings, and facilities don’t want the liability of a sick dog on their watch. If your boarding kennel requires a booster every six months, your vet will generally comply even though the research supports annual intervals for most dogs.

How Well the Vaccine Works

No vaccine guarantees zero chance of illness, but Bordetella vaccines substantially reduce the severity and likelihood of disease. A recent efficacy trial of a subcutaneous vaccine tested in puppies illustrates this well. Among vaccinated puppies, only 5% coughed over two consecutive days after being exposed to the bacterium, compared to 80% of unvaccinated controls. The average duration of coughing was about three days in the vaccinated group versus sixteen days in controls, and vaccinated puppies also shed far fewer bacteria.⁶

In shelter settings where dogs are densely housed and constantly exposed, implementing routine vaccination on intake has shown clear benefits. One shelter dealing with a respiratory disease outbreak tracked what happened as they began vaccinating all incoming dogs. As the proportion of vaccinated dogs in the shelter climbed above 90%, the proportion of dogs actively coughing dropped significantly compared to when coverage was lower.⁷ This is important context: individual protection matters, but so does the broader effect of reducing the overall pathogen load in a group of dogs.

The vaccine doesn’t make your dog invincible. A vaccinated dog that spends a week at a busy boarding facility during peak holiday season can still develop a mild cough. But the illness is typically shorter, less severe, and less likely to progress to something serious like pneumonia.

Side Effects Are Usually Mild

Bordetella vaccines are generally well tolerated. In a controlled trial of two intranasal vaccines given to dogs entering a humane shelter, there were no differences in adverse events like coughing, sneezing, or nasal or eye discharge between vaccinated dogs and those receiving a placebo during the first three days after administration or beyond.⁸ That said, veterinarians commonly report that some dogs sneeze a few times or have mild nasal discharge for a day or two after the intranasal vaccine, and occasional mild lethargy or a slight fever after injectable forms. These are transient and resolve on their own.

Serious reactions are rare. As with any vaccine, anaphylaxis is possible but exceptionally uncommon. If your dog has had a previous bad reaction to any vaccine, make sure your vet knows before giving a Bordetella booster. For most dogs, the experience is unremarkable: a quick squirt up the nose or a small injection, and they’re done.

Why You Can’t Use a Blood Test to Skip the Booster

For some core vaccines like distemper and parvovirus, veterinarians can run titer tests, which measure antibody levels in the blood, to determine whether a dog still has adequate immunity and can safely skip a booster. This approach does not work for Bordetella. Research has shown that antibody levels against Bordetella bronchiseptica in the blood have no predictive value for whether a dog will get sick or how severe the illness will be. Dogs with high antibody levels showed no protection advantage, and there was no correlation between rising antibody levels and the development of disease or the presence of bacteria in the lungs.⁹

This is a genuinely frustrating piece of the puzzle. It means there’s no shortcut to determine your dog’s current level of protection. The immune response to Bordetella is complex and depends heavily on local immunity in the respiratory tract rather than circulating blood antibodies. So even if someone offers you a titer test for Bordetella, the result wouldn’t tell you anything useful about whether your dog needs a booster. Sticking to the regular schedule is the practical answer.

Bordetella Is Only Part of the Kennel Cough Picture

One common misconception is that “kennel cough” is a single disease caused by one bug, and the Bordetella vaccine prevents it entirely. In reality, canine infectious respiratory disease is caused by a mix of bacteria and viruses, and Bordetella bronchiseptica is just one player. A large epidemiological study looking at respiratory pathogens in dogs found that canine parainfluenza virus and Mycoplasma species were actually more commonly detected than Bordetella, which was identified in about 9% of cases. Canine influenza was found at a similar rate.¹⁰

This matters because vaccinating against Bordetella alone won’t prevent every case of kennel cough your dog might encounter. Many veterinarians address this by using combination products. The intranasal vaccine, for example, often includes canine parainfluenza virus alongside the Bordetella component, covering two of the common culprits in a single dose. Some vets also recommend the separate canine influenza vaccine for dogs with very heavy social exposure. If your dog comes home from boarding with a cough despite being up to date on Bordetella, it doesn’t mean the vaccine failed. It likely means another pathogen was responsible.

Young Dogs and High-Risk Populations

Puppies are especially vulnerable to Bordetella. In a clinical study of dogs diagnosed with Bordetella bronchiseptica respiratory infections at a veterinary hospital, the median age was just five months, and over 80% were less than a year old. About 40% of the cases were classified as severe, meaning they had progressed to pneumonia, and more than half were classified as refractory, meaning they didn’t respond quickly to initial treatment.¹¹ These aren’t mild sniffles. For young puppies, particularly those under six months old, Bordetella can be a genuinely serious infection.

This is why many vets recommend starting Bordetella vaccination early if a puppy is going to be in group settings. Intranasal and oral vaccines can typically be given as early as eight weeks of age, while injectable forms usually start a few weeks later and require an initial two-dose series. If you’re planning to enroll a puppy in a socialization class or start daycare early, talk to your vet about timing the vaccine so your puppy has some protection before first exposure.

Older dogs and those with chronic respiratory conditions or weakened immune systems also deserve extra attention. While the majority of severe Bordetella cases occur in the young, any dog whose immune defenses are compromised has an elevated risk of complications if infected.

The Zoonotic Angle

Most dog owners don’t realize that Bordetella bronchiseptica can, in rare circumstances, infect humans. The risk is overwhelmingly concentrated among people with seriously weakened immune systems, such as those undergoing chemotherapy, organ transplant recipients on immunosuppressive drugs, or people with HIV. Bordetella bronchiseptica spreads via respiratory droplets, and transmission from dogs and cats to immunocompromised humans is being increasingly recognized as a real, if uncommon, concern.¹²

Vaccinating your dog does not guarantee that an immunocompromised person in the household is safe, because the vaccine prevents disease in the dog but doesn’t necessarily eliminate all bacterial shedding. If someone in your home is immunocompromised, keeping your dog’s Bordetella vaccine current is a reasonable precaution, but it’s worth a conversation with both your vet and the person’s physician about additional steps to reduce exposure. For healthy adults and children, the risk of catching Bordetella from a dog is negligible.

What About Cats

If you have both dogs and cats, you might wonder whether your feline needs a Bordetella vaccine too. The picture is quite different for cats. An intranasal modified-live Bordetella vaccine exists for cats, licensed as a single dose with annual boosters. However, Bordetella infection in cats generally causes only mild disease, and the vaccine is considered noncore for felines as well. Routine vaccination of cats against Bordetella is not recommended unless they are in high-risk environments like shelters or multi-cat breeding operations.¹³ One practical note: dog-formulation Bordetella vaccines should never be given to cats, and vice versa. The products are species-specific.

When to Talk to Your Vet About Changing the Schedule

The annual booster works for the majority of pet dogs. But there are a few situations where the schedule might shift. Dogs that board frequently throughout the year or attend daycare several days a week may be recommended for boosters every six to twelve months, depending on the veterinarian’s judgment and the facility’s requirements. Dogs in areas experiencing a known outbreak of canine respiratory disease might be boostered earlier than usual as a precaution.

On the other end, a retired dog that used to go to daycare but now spends its days napping at home might no longer need the vaccine at all. Bordetella is noncore for a reason: the decision is tied to exposure risk, and risk changes as a dog’s lifestyle changes.¹⁴ If your dog hasn’t been to a boarding facility, groomer, or dog park in over a year, it’s worth asking your vet whether continuing the vaccine makes sense. On the flip side, if you adopt a new second dog or start a new activity that involves group canine settings, it’s time to add Bordetella back into the rotation.